Module io.helidon.config
Package io.helidon.config.spi

Interface RetryPolicy

All Superinterfaces:
Supplier<RetryPolicy>
All Known Implementing Classes:
SimpleRetryPolicy
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface RetryPolicy extends Supplier<RetryPolicy>
Mechanism for controlling retry of attempts to load data by a ConfigSource.

When a Config attempts to load the underlying data of a ConfigSource it uses a RetryPolicy to govern if and how it retries the load operation in case of errors.

The execute(java.util.function.Supplier) method of each policy implementation must perform at least one attempt to load the data, even if it chooses not to retry in case of errors.

  • Method Summary

    Modifier and Type
    Method
    Description
    default boolean
    cancel(boolean mayInterruptIfRunning)
    Cancels the current use of the retry policy.
    <T> T
    execute(Supplier<T> call)
    Invokes the provided Supplier to read the source data and returns that data.
    default RetryPolicy
    get()
     

  • Method Details

    • execute

      <T> T execute(Supplier<T> call)
      Invokes the provided Supplier to read the source data and returns that data.

      The implementation of this method incorporates the retry logic.

      Type Parameters:
      T - result type
      Parameters:
      call - supplier of T
      Returns:
      loaded data returned by the provided Supplier

    • cancel

      default boolean cancel(boolean mayInterruptIfRunning)
      Cancels the current use of the retry policy.

      Implementations should correctly handle three cases:

      1. cancel invoked when no invocation of execute is in progress,
      2. cancel invoked when an invocation of execute is active but no attempted load is actually in progress (e.g., a prior attempt failed and the retry policy is waiting for some time to pass before trying again), and
      3. cancel invoked while a load attempt is in progress.
      Parameters:
      mayInterruptIfRunning - whether an in-progress load attempt should be interrupted
      Returns:
      false if the task could not be canceled, typically because it has already completed; true otherwise

    • get

      default RetryPolicy get()
      Specified by:
      get in interface Supplier<RetryPolicy>